68690145769 has 32 divisors (see below), whose sum is σ = 80950609152. Its totient is φ = 57062016000.

The previous prime is 68690145767. The next prime is 68690145779. The reversal of 68690145769 is 96754109686.

It is a cyclic number.

It is not a de Polignac number, because 68690145769 - 2¹ = 68690145767 is a prime.

It is a super-2 number, since 2×68690145769² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68690145767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30112909 + ... + 30115189.

It is an arithmetic number, because the mean of its divisors is an integer number (2529706536).

Almost surely, 2^68690145769 is an apocalyptic number.

It is an amenable number.

68690145769 is a deficient number, since it is larger than the sum of its proper divisors (12260463383).

68690145769 is a wasteful number, since it uses less digits than its factorization.

68690145769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2977.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 68690145769 in words is "sixty-eight billion, six hundred ninety million, one hundred forty-five thousand, seven hundred sixty-nine".